Take seven ounces of quicksilver, as much tin, and grind them well together with fourteen ounces of sublimate dissolved in a cellar upon a marble the space of four days. It will become like oil of olive, which distill in sand. There will sublime a dry substance. Then put the water which distills off back upon the earth in the bottom of the still, and dissolve what you can. Filter it and distill it again. This do four or five times. Then that earth will be so subtle that, being put into a vial, the subtle atoms thereof will move up and down forever.
Note that the vial or glass must be close stopped and kept in a dry place.
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